DevOps Classroomnotes 07/Aug/2022

Ansible Variables

  • Variables in Ansible can be declared in

    • Playbooks
    • Inventory files
    • Many other locations
  • Lets write playbook to install tomcat Refer Here

Scenario: Installing tomcat9 on ubuntu 20.04

  • Lets verify if the manual steps are working or not
  • Step -1 : install java
sudo apt update
sudo apt install openjdk-11-jdk -y
  • Refer Here for the playbook and inventory created so far.
  • Step 2: Create a tomcat user: Refer Here for the manual steps
  • We have create a task using user module to create system user. Refer Here for the changes added.
  • Now lets download the tomcat tar file and extract it and Refer Here for the changes done in the playbook to accomodate tomcat download and extract
  • Now lets try to write an ansible task to create a symbolic linkm sudo ln -s /opt/tomcat/apache-tomcat-${VERSION} /opt/tomcat/latest
  • Refer Here for the changes to create symlink
  • This playbook is creating the latest tomcat folder with root permissions Refer Here
  • To automate the step sudo sh -c 'chmod +x /opt/tomcat/latest/bin/*.sh' one approach is to use
    • ansible.builtin.command which executes the linux command
  • The problem with this approach is, it is not idempotent. So the command will be executed every time ansible playbook is executed.
  • To solve this problem,
    • We can use lookups
    • Registering varaibles

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